Rocker arm and rocker-arm shaft



Jan. 22, 1929.. 1,699,659 L J. T. PAGAN Rocxm ARM Arm .ROCHER ARM'SHAPT Filed Sept. 30, 1927 /HN @lmnp 1111 I Patented Jan. 22, 1929.

Room .um AND HOOKER-ARM SHAFT. Application and september 3o, 1927. serial No. 223,006.

This invention relates to rocker arms of Fig. 10 is a transverse sectional view on the undersl'ung type and rocker arm assemthe line 10-10 of Fig. 9, looking to the lies, including their shafts, and means to right; and ubiicate the bearing surfaces thereon, for Fig. 11 is an enlarged View of a longitudio use with internal combustion engines, such nal section on the line l111 of Fig. 8, show- 60 as are used in automobiles, motor boats, etc. ing the oil hole and fibrous oil feed plug An object of the inventi n is to provide a t erein. rocker arm assembly that will be practi- In Figure 1, the rocker arm 1, which is cally free from noise in operation, and also of the underslung ype, is shown as a suitable 10 e practically frictionless. metal erging, or it ma be a suitable cast- 65 A further object is to provide a rocker ing, and is provided witiila recess in the ccnarm assembly that is chea may be quickly ter, 2, which constitutes an oil well, and arcinstalled on existing automobiles, and that sha ed bearing surfaces, 3, 3, on the upper is very durable in use. sur ace on each side. The inner walls 4. 4, l5 A further object is to provide a rocker of t e oil Well 2, are preferably milled 70 arm assembly that serves as an oil reservoir, smooth and parallel to form bearing surand that maintains all bearing surfaces faces, and co-operate with surfaces 14 on t oroughly oiled. the shaft to maintain the rocker arm in urther object is to provide a troughalinement as hereafter described. At the 20 like shaft that will hold a supply of oil, and outer ends of the oil well 2 are holes or 75 that will' slowly feed the same to the bearducts 5, 6, at each end, through which a suiting surfaces, and to the rocker arms. able wick, Fig. 2, is threaded, the central further object is to provide a balanced part of the wick dipping into the oil well rocker arm that has a very minute movement and the ends serving to continuously supply 25 and that has a rolling action upon its bearoil to the outer surfaces of the roc Ier arm 80 ing, as distinguished from a simple oscillaand especially to the end bearing surfaces 8 tion on aV knife edge. and 9, which contact with the'valve stem 11 further object is to provide a rocker and push rod 21 of the engine. The rocker arm that has an oil well2 and a wick to suparm may be hardened by any of the com- 3" p y oil to the outer bearing surfaces monly known processes of carbonizln or 85 ther objects will appear onl reading the may be chrome plated. The end 10 of the specifica ion. rocker arm is provided with a threaded open Vn the accompanying drawings: i ing through which a hardened bea-ring surig. 1 is a View in perspective of the imace 9 is secured, and which receives the imi .proved rocker arm. pacts from the push rod 21. 9o

1g. 2 1s a similar View, but also showin The shaft 12, Figures 7, 8, 9, 10, and 11, I E represents a simple structure, preferably conduct films of oil to the outer bearings. made of sheet steel, stamped, or 1t may be Fig. 3 is a plan view of the rocker arm. forged, and with pressed-out lobs 13, having ig. 4 is a side elevation of the rocker smooth parallel sides 14, which co-operate 95 arm. with the inner Walls 4, 4, of the rocker arms Fig. 5 is a transverse sectional view of the to maintain the rocker arm in alinement as rocker arm, on the line 5-5 of Fig. 4, looknoted above. The shaft is also provided ing toward the push-rod end. with ends 20, 20, to provide an oil holding Fig. 61's a longitudinal sectional view of well. The underrounded edge 15 of the 100 the roc er arm, showing a section of the shaft 12 is smoothed and polished, and shaft, and also showing the oil in the oil serves as the bearing surface against which Fig. 7 is a View in erspective showinv rocker arm 1 rests. The radius of curvature the rocker arm mountedp on a section of the of the rounded edge 15 of the shaft is less 105 diaft, and s owing the valve stem and the than the radius of curvature of the cooperat- )ush rod. ing bearing surfaces 3, the rocker arm in the bottom of the is present in the ordinary V-shaped knifeedge bea-rings, or the tubular bearing and rod-shaft type.

The lob 13 depends into the oil well 2, and lob is a duct or perforation 16 in which is a fibrous plug 17, Figs. 6 and 11, for example of soft wood, serving as a wick to feed the oil slowly from the supply in the shaft to the rocker arm. ie shaft 12 is also provided with flattened bottom surfaces 18, 18, provided with openings 19, throu rh, which the shaft is secured y means of iolts or the like to supports on the engine body. The central, vertical plane of the surfaces 18, 18, passes through the central vertical plane of the rounded bearing surface 15. Owing to the well balanced construction and support, and its slight resulting movement, which is a rolling` movement, the operation of the rocker arm is as near silent as it is possible for a -device o this kind to be, and the wear after a long test is negligible.

I claiml. A rocker arm assembly comprising a rocker arm and shaft, said rocker arm provided with a recess, bearing walls on the sides of said recess, and a depending lob o said sha-ft projecting into said recess, the sides of said lob co-operating with the sides of said recess to maintain said rocker arm in alinement.

2. A rocker arm assembly comprising a rocker arm an shaft, said rocker arm provided with a recess adapted to hold oil, oilfeeding ducts from said recess, bearin wall surfaces on the sides of said recess, sai sha t constructed to conduct oil, a depending lo from the shaft extending into said recess, said lob provided with bearing surfaces and adapted to co-operate with the side walls of the recess to maintain the rocker arm in alinement, and oil ducts from said shaft to feed oil to said recess.

3. An underslung rocker arm comprising astructure having a recess, curved bearing surfaces on the upper part of said structure, side bearingwalls in said recess, and oil feeding means leading from said recess to the outer bearing surfaces at the ends o said rocker arm.

4. An undcrslung rocker arm comprising a structure having a recess, bearing surfaces on the upper part of said rocker arm, and side bearing surfaces within said recess.

5. A shaft provided with a lower curved bearing edge, a projection extending below said bearing edge, said projection provi( ed with bearing surf ace sides, said bearing surface sides in a plane at right angles with the longitudinal axis of the shaft.

(i. A shaft comprising au oil feeding body, a lower curved edge comprising a bearing edge surface, a depending lob extending below the bearing edge, the sides of said lob constituting bearing surfaces, and a oil duct from sai sha t.

7. A shaft comprising an oil feeding body, a lower curved bearing surface thereon, a depending bearing surface, the sides of said lob consti` tuting bearing surfaces, an oil duct, and a wick-like body in said duct.

8. A shaft comprising an oil feeding body, a lower curved bearing surface thereon, a depending lob extending elow the curved bearing surface, the sides of said lob constituting bearing surfaces, an oil.duet. a wickby which like body in said duct, and means the shaft is secured to a support.

9. A rocker arm assembly' comprising :i rocker arm and shaft, said rocker arm im ing a longitudinal opening therein, side hear ing walls on said opening, said shaft having a transverse enlargement with side bearing surfaces said transverse enlargement registering and co-operating with the longitudinal opening of the rocker arm to maintain the rocker arm in alinement.

10. A shaft comprising an oil feeding body, a lower curve bearing surface thereon, a depending lob extending below the curved bearing surface, the sides of said lob constituting bearing surfaces, an oil duct to discharge oil from the shaft, and means comprising areas above the bearing surface by which the shaft is secured to a support.

11. A rocker arm assembly comprising an underslnng rocker arm and shaft, co-operating bearing surfaces, and co-operating inter engagin elements independent of the bear ing sur aces on said 'rocker arm and shaft adapted to maintain said rocker arm in alinement.

12. An underslnng rocker arm provided with longitudinal and'transverse linear bearing surfaces, both sets of bearing surfaces arranged to co-oper te with a shaft to mainA tain said rocker arm in alinement.

13. A shaft provided with longitudinal and transverse bearing surfaces, a rocker arm, said rocker arm constructed to simultaneously engage said longitudinal and transverse bearing surfaces.

ln testimony whereof I hereby signature.

aix my JOHN T. PAGAR.

lob extending below the shaft 

